Edward Joseph O'Brien was an Australian international rugby union player.
Emigrating from Ireland at age 16, O'Brien was based in Central Queensland and went by the nickname "Hannah".
O'Brien was a Queensland representative lock forward and gained international honours on Australia's 1905 tour of New Zealand, where he featured in minor matches against Canterbury and Auckland, after which he retired.
A Mount Morgan miner, O'Brien was employed for close to three decades as a check inspector.